计算(x-y)²(x+y)²
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计算(x-y)²(x+y)²
(x-y)²(x+y)²
=[(x-y)(x+y)]²
=(x²-y²)²
=x⁴-2x²y²+y⁴
=[(x-y)(x+y)]²
=(x²-y²)²
=x⁴-2x²y²+y⁴
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